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第八届中国功能材料及其应用学术会议

作者： TU Fu-quan MAO Yang XU Ren-bo Key Laboratory of Metallurgical Equipment and Control Technology Ministry of EducationCollege of Machinery and AutomationWuhanUniversity of Science and Technology

ISBN: (纸本)9783037859698

In this paper,the magnetically controlled characteristic and shape variation mechanism magnetic shape memory alloys(MSMA) sample are studied through the servo valve actuatorbased on *** MSMA is a new type of functional materials,which has huge drivingforce and large controllability *** kind of actuator is designed by differential modeof MSMA,employing bias coils to generate biasing magnetic field and applying field coils to provide magnetic field which is *** between displacement of the new actuator and time is got by numerical simulation using maxwell ***,motivated by the simulation results,the rationality of structural design of the new type of actuator is validated.

关键词： MSMA actuator Field coils Bias magnetic field maxwell simulation

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Double-ring high-frequency common-mode switching oscillation current sensor for inverter-fed machine winding insulation monitoring

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Global Energy Interconnection 2024年第1期7卷 106-116页

作者： Lingqing Pan Xizhou Du Xing Lei Ting Ye Dawei Xiang Hao Li College of Electrical Power Engineering Shanghai University of Electric PowerShanghai 200090P.R.China State Grid Shanghai Municipal Electric Power Company Shanghai 200122P.R.China College of Electronics and Information Engineering Tongji UniversityShanghai 201804P.R.China

Insulation failure significantly contributes to the unpredictable shutdown of power *** to the partial discharge and high-frequency(HF)injection methods,the HF common-mode(CM)leakage current method offers a non-intrusive and highly sensitive ***,the detection of HF CM currents is susceptible to interference from differential-mode(DM)currents,which exhibit high-amplitude and multifrequency components during normal *** address this challenge,this paper proposes a double-ring current sensor based on the principle of magnetic shielding for inverter-fed machine winding insulation *** inner ring harnesses the magnetic aggregation effect to isolate the DM current magnetic field,whereas the outer ring serves as the magnetic core of the Rogowski current sensor,enabling HF CM current ***,the magnetic field distributions of the CM and DM currents were ***,a correlation between the sensor parameters and signal-to-noise ratio of the target HF CM current was ***,an experimental study was conducted on a 3-kW PMSM for *** results indicate that the proposed double-ring HF CM sensor can effectively mitigate DM current *** to a single-ring sensor,a reduction of approximately 40%in the DM component was achieved,which significantly enhanced the precision of online insulation monitoring.

关键词： Magnetic shielding Double-ring Common-mode current maxwell simulation

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